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Summary of Significant Accounting Policies (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2012
Sep. 30, 2011
Summary of Significant Accounting Policies (Textual) [Abstract]            
Advertising expenses, included in selling, general and administrative expenses   $ 15 $ 16 $ 17    
Unrecognized tax benefits recognition probability percentage   50.00%        
Maximum expected period for uncertain tax positions to be unclassified as non-current other liabilities   1 year        
Bad debt recovery expense (recovery)   4 1 (1)    
Percentage of the unadjusted fair value of derivative instruments   15.00%        
Useful lives of identifiable intangible assets   13 years        
Impairment charge related to goodwill and other indefinite-lived intangible assets 0          
Parent company indirectly owning equity in Worldwide 100.00% 100.00%        
Minimum percentage of likelihood that fair value of goodwill more than carrying value           50.00%
Minimum percentage of likelihood that fair value of indefinite-lived intangible asset more than carrying value         50.00%  
Software Development [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Software amortization cost   $ 89 $ 81 $ 65    
Maximum [Member] | Building [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   30 years        
Maximum [Member] | Leasehold Improvements [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   20 years        
Maximum [Member] | Software Development [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   10 years        
Maximum [Member] | Furniture, fixtures and equipment [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   7 years        
Minimum [Member] | Software Development [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   3 years        
Minimum [Member] | Furniture, fixtures and equipment [Member]
           
Summary of Significant Accounting Policies (Additional Textual) [Abstract]            
Property and Equipment Useful Life   3 years